Why does the 4s orbital come before the 3d orbital

the 4s orbital has a lower energy level then 3d orbital

The following statements about valence electrons are correct except

Each element in the 3rd period have 3 valence electrons

We say an electron configuration is the most probable location for a set of electrons

because electrons are always randomly moving

What is false about the s orbital?

has 3 orbitals per energy level

what is the electron configuration for xenon

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 4d10 5s2 5p6

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Questions 13

Answers

1
Atoms can either lose or gain electrons in order to do all of the following except
achieve stability (lower energy)
become an isotope
achieve a valence octet of electrons
to be like noble gases
2
Calcium
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 4d10 5s2
1s2 2s2 2p6 3s2 3p6 4s2
1s2 2s2 2p6 3s2
1s2 2s2 2p6 3s2 3p6 4s1
3
Why does the 4s orbital come before the 3d orbital
the 4s orbital has a lower energy level then 3d orbital
because electrons are weird
electrons like to go to higher energy levels first
the 4s orbital has a higher energy level then 3d orbital
4
The following group will lose valence electrons
Group 18
Group 15
Group 2
Group 13
5
The following statements about valence electrons are correct except
Valence electrons can be gain or lost
helium has 2 valence electrons
Valence electrons are located in the outermost energy level
Each element in the 3rd period have 3 valence electrons
6
What ion does sulfur form?
neon
positively charged ions
cation
anion
7
The dots around the symbol in an electron dot notation symbolize the
protons
electrons and neutrons
electrons
atoms
8
We say an electron configuration is the most probable location for a set of electrons
because electrons are positive
because electrons sometimes end up in the nucleus
because electrons are always randomly moving
because electrons can turn into neutrons
9
Fill in the following order 3s, 3p, 4s,____, ____, 5s
3d, 4p
3d, 4f
4p, 3d
4d, 3p
10
What is false about the s orbital?
is a sphere shape
has 3 orbitals per energy level
elements in group 1 or 2 has valence electrons in s orbital
holds up to two electrons
11
what is the electron configuration for xenon
1s2 2s2 2p6 3p6 4s2 3d10 4p6 4d10 5s2 5p6
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 4d10 5s2 5p6
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 5p6 4d10
12
The following statement about atomic orbitals is correct
electrons spin the same way
The s orbital holds 2 electron
There are 6 d orbitals which can hold 12 electrons
The s orbital is infinity/ dumbbell shaped
13
Group 18 is
noble gases
halogens
Alkali metals
alkaline earth metals

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